Your question is unclear and confusing. Draft question clearly. However, In India, (1) a WILL can be on plain white paper (2) There is NO need to inform legal heirs about the Will (3) Will doesnot need to be registered .
The essential requirement for a Will to be in valid format are :
(1) The date and signature of the testator should be clearly marked. Signature should be on each page.
(2) There must be names ,addresses and signatures of ATLEAST two attesting witnesses.
You must understand that Will doesnot prove anything about the ownership of the property. If there are two Wills giving the same property...the issue as to who is the owner of the property will be decided in a Civil Case to know the title/ownership.
On a lighter note, I can give you TAJ MAHAL in my Will...But can you get TAJ MAHAL ? NO. Because I am not the owner of Taj Mahal.